Warp tension let-off device for looms



y 1953 L. RITSKY -2 ;646,081

. WARP TENSION LET-OFF DEVICE FOR LOOMS Filed April 22, 1952 FIG. l.

FIG. 3.

INVEN TOR.

Lou/5 R/TsKY Patented ,July 21,1953

- V UNITED .STATES PATENT OFFICE v WARP TENSION LET-OFF nEvIcE 'FOR LOOMS Louis Ritslfy, Philadelphia, Pa.

Application April 22, 1952, SerialNo. 283,563

.This invention relates to warp tension let oif devices .for looms, and has for its primary obiect the provision of a device of this character which 'adrumpn the warp beam, and one or more suspended weights usually serves to apply pull on the band 'to thereby cause the same to be held frictionallyagainst the drum. Aside fromother objections possessed .by such an arrangement,

there is the objection thatittends to obstruct the rear of the loom and makes it practically .impossible to employ more than one row of warp beams.

It :is therefore an object of the present invention to provide a .deviceof the character described in which the use of tension-applying weights is obviated; in which the warp beam will be :permitted to rotate when required under the'pull of the threads, and in which an automatic braking and application of tension will be at once applied as the rotation of the warp beam is ceased.

More particularly, the invention contemplates the provision of a warp beam provided with a drum carrying a plurality of brake band segments which are pivotally and adjustably connected at one, end and have allever or pry bar pivotally connected to one of the segments and interposed between the segments and arranged to operate with other elements to allow the seg- 'ments to be brought toward one another :into brake-application position as soon as the pull of the warp thread ceases, whereby an immediate I braking effeoton the warp beam occurs. As will appear hereinafter, this arrangement is such as to permit rotation oi the warp beam as required, andan' immediate application of braking and tensioning force when the rotation of the warp beam ceases.

In the accompanying drawing, wherein an illustrative embodiment of the invention :is disclosed, Fig. l is a top plan view of the improved structure; Fig. 2 is asectional view taken substantially on the line 2-2 of Fig. 1, looking in the direction of the arrows,.showing the braking device in released position; and Fig. 3 is a view similar to Fig. 2, but showing the device in applied position but with the free end of the lever raised ofi the stop pin in order to show'construction. I 1

6 Claims. (Cl. 139+100) Referring to the drawing, 1 indicates the warp beam, carrying the .conventionalwarp threads 2, which are drawn downwardly from the warp beam .as seen in Fig. ;2. The shaft ,3 of the warp beam is rotative in suitablexb'earings 3.9 and carries a drum 4 having its periphery embraced by the brake segments :5 and 16, each of which is provided with the conventional brake lining J, iriotionally operative against the peripheryof the drum 4. At one .end, the segment .5 is provided with a projecting 'lug 8, which is :pivotally .and threadably engaged "with an adjusting :screw 9. A .similar projecting lug is provided on the segment 6, as indicated at :m and the same is also pivotally and .threadably engaged with the vadjusting screw :9. This arrangement is such as to enable the two segments to beadjusted relatively to oneanother tothereby engage the drum 4 :with the requi-r-edibraking force.

At its opposite end, the segment 5 is provided with alug H and .a similar lug, shown at l 2,is provided on the segment 15. A pin 13 extends through the lugs H and 2, and between the lug ll and a nut M and a Washer arranged on one end of the pin [3 is a coil spring 15. A similar coil spring surrounds the pin I 3 between-the lug i2 and the :nut 11 and its washer. By adjustment of the nuts 14 and Fl on the opposite threaded ends of the pin '13, the pressure of the springs l5 and I6 can be regulated so that the braking force will be applied to the required degree when required.

At 18 is shown a lever or pry-bar which has a downwardly-bent end or tip 19 fitting into an aperture 20 provided in the lug I 2. The lever 18 is also provided with an aperture 25 extending through it to permit the passage of the pin l3.

Near its free end, the lever or pry-bar i8 is provided with an aperture 22 adapted to fit over a projecting pin 23 extending rigidly upwardly from a portion '24 .of the frame of the loom. A compression-coil spring 25 surrounds the pin 23 and is supported upon the portion 24 of the frame.

From the foregoing, the operation of the improved let-ofi device will 'be readily understood. The normal position of the device is that shown in Fig.3, except that the end of the lever will be actuallyfitted on the pin '23, at which time the other under the pressure of the springs l5 and 16. As a pull is exerted on the warp threads 2, the warp beam will begin to rotate in a counterclockwise direction and such rotative movement will bring the free end of the lever l8 downwardly along the pin 23 and forcibly against the spring 25 which will then act as a stop or stop element, until a prying action will be imparted to the lever l8, as shown in Fig. 2, causing the lugs i l and E2 to be pried apart by said lever, as clearly seen in Fig. 2, to tend to separate the segments 5 and l and thus release the braking force upon the drum 4 and permit rotative movement of the warp beam I under the pull of the warp threads. As long as the pull of the warp threadsis exerted, the lever It will remain in its prying position as shown in Fig. 2 and the brake segments remain in the unapplied position of Fig. 2.

As soon as the pull on the warp threads is discontinued, the holding down of the lever 18 on the spring 25 will cease, and the lever will then lift and assume an elevated position ceasing its prying action and permitting the springs 15' and [B to at once become active to draw the segments 5 and 6 toward one another and to apply their lined faces irictionally against the drum 4 and halt further rotative movements of the warp lbeam. It will be understood that lever l8 never actually rises off the pin 23 as shown in'Fig. 3,

such position being shown merely to indicate the manner in which the braking elements are supported solely on the drum l.

Thus the lever l8 may be fulcrumed at any suitable place on the frame or even on the iloor supporting the machine, the main object being to leave the rear of the loom unobstructed.

From the foregoing, it will be apparent that the operation of the device is quite automatic,

with the release of the braking force taking place by the pull of the warp threads and the braking force and slack take-up immediately applied upon the cessation of the pull upon the Warp beam by the warp threads.

Having described one embodiment of the invention, it is obvious that the same is not to be restricted thereto, but is broad enough to cover all structures coming within the scope of the annexed claims.

What I claim is:

1. In a loom, a rotative warp beam, a drum carried thereby, a plurality of brake band segments overlying the drum, the segment being adjustably connected at one end, the opposite end of each segment being provided with a lug, spring means for urging the lugs toward one another, a lever interposed between the lugs and connected to one of said lugs, and a stop element for the lever adapted to incline the lever when the warp beam is under pull of the warp threads to thereby cause the lever to pry the lugs apart to release pressure of the brake band segments on the drum.

2. In a loom, a rotative warp beam provided with a drum, a pair of brake band segments overlying the drum, spring means normally operative lying the drum, the segments being pivotally and adjustably connected together at one end, each segment being provided with a projecting lug at its opposite end, spring means operative upon the lugs for normally urging the same toward one another to maintain the segments in braking position, a lever having an end portion pivotally connected to one of the segments, said end por tion being disposed between the segments, and

a stop for the opposite end of the lever adapted to cause the portion of the lever that is interposed between the lugs to pry the lugs apart when the lever is held in engagement with the stop by the pull of the warp threads.

l. In a loom as provided for in claim 3, wherein the spring means is mounted on a pin extending through the lugs, the lever having an aperture through which said pin passes, and the stop includes a spring against which the lever is held when the warp beam is rotated by pull of the warp threads.

5. In a loom, a rotative warp beam, a drum on the warp beam, a pair of brake segments overlying the periphery of the drum, an adjusting screw threadably and pivotally connected to one end of each of the segments, each of the segments being provided at its opposite end with a lug, a pin extendin through the lugs, springs surrounding the pin and normally operative to force the lugs toward one another and to urge the segments into braking contact with the drum, a lever having an end portion disposed between the lugs, said lever having an aperture through which the pin passes, the end portion of the lever having a downturned tip entering an aperture in one of the lugs, the lever having a free end provided with an aperture, a frame element provided with an upstanding pin surrounded 'by a coil spring, said pin being adapted to fit within the aperture in the free end of the lever and the lever held against the coilspring while the warp beam is rotated under the pull of the warp threads to thereby cause the portion of the lever that is located between the lugs to exert a prying action on said lugs to force the same apart and retain the segments in released position as long as pull is exerted on the warp threads.

'6. In a loom, a rotative warp beam, braking means thereforconsisting of a pair of segments normally held in braking position while the warp beam is stationary, and a prying element having a part interposed between the segments, means for engaging said prying element when the warp beam is rotated under pull of the warp threads, to thereby pry the segments apart and retain them in released position as long as warp thread pull is imposed on the warp beam.

LOUIS RITSKY.

References Cited in the file of this patent UNITED STATES PATENTS 

